Water sloshing sound in roof?

[Doubeleive]

From what I hear the dealers are breaking as many things as they’re fixing right now until they get experience disassembling the interiors. Good call.

sounds about right I have to drop the silverado off tomorrow for them to put in a new cluster they want it for 2 days, lol I was like ok.... I suspect that's in case they break something and have to replace it hahaa, but they did say they want to check the next day and see if the problem is resolved that it does when it is cold.

 

[BigJohn76]

The drain tubes run into the A post and drain out the bottom onto the ground. Open the sunroof and stand up in it and you can see the drain openings in each front corner. A coat hanger or large string trimmer line can be pushed into them. You can pour some water on the tray up there and watch it hit the ground if you have them cleaned out.

 

[Rocket Man]

The drain tubes run into the A post and drain out the bottom onto the ground. Open the sunroof and stand up in it and you can see the drain openings in each front corner. A coat hanger or large string trimmer line can be pushed into them. You can pour some water on the tray up there and watch it hit the ground if you have them cleaned out.

Why would the TSB say to turn on the hvac, turn it to fresh air, and run the fan to clear the sunroof drains then? Are you sure you’re talking about the 2021’s ?

 

[B520044]

Why would the TSB say to turn on the hvac, turn it to fresh air, and run the fan to clear the sunroof drains then? Are you sure you’re talking about the 2021’s ?

Yeah, I don't get it. BUT, today it rained and on drive home from work it started gurgling again. I turned off the air circulation and left the fresh air running. The water sounds went away. Crazy, not sure why this is tied into the hvac vents?

 

[Rocket Man]

Yeah, I don't get it. BUT, today it rained and on drive home from work it started gurgling again. I turned off the air circulation and left the fresh air running. The water sounds went away. Crazy, not sure why this is tied into the hvac vents?

Not sure but it must go to the same drain as the hvac wherever that is. I know there’s always water that drains out after using the ac so it must connect to that.

 

[olyelr]

You guys are narrowing it down!

 

[Holy Roller]

Placing the HVAC on fresh air, and increasing the fan speed, raises the air pressure inside the cabin, forcing the water down the drains.

HVAC on recirc decreases cabin air pressure, relative to the pressure of the air pushing against the bottom of the sunroof drains. Thereby causing water to drawn like a straw gurgling up through the hoses.

Many years ago (maybe 20 or more) there was a TSB regarding dust being drawn up around door seals due to the negative cabin air pressure relative to that of the air rushing around the exterior of the moving vehicle. I can’t quite recall, but it may have been for the Gen 1 1999-2000 Escalade, that introduced triple door seals on the GMT-400 platform.

 

[SAdude]

This is happening to me. Anyone get the dealer to fix it?

 

[exp500]

Extend the drain tubes 2 inches or so lower than presently. Cut end of extension at 45 degree with taper facing rear. It is an Air pressure problem, why turning blower/outside air on helps.